旋印电解加工  

Counter-Rotating Electrochemical Machining

作　　者：朱荻[1] 王登勇[1] 朱增伟[1] ZHU Di;WANG Dengyong;ZHU Zengwei(College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《南京航空航天大学学报》2022年第5期743-750,共8页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：航空发动机机匣是航空发动机重要的连接、承载部件,它结构复杂、刚性弱、材料难加工,目前存在加工变形严重、壁厚精度差等制造难题,已成为制约新型航空发动机研制和生产的瓶颈。针对薄壁机匣的制造需求,本文提出了旋印电解加工技术,该技术采用回转体电极作为阴极工具,通过工件与工具的同步对转对阳极工件逐层精确溶解去除,实现薄壁机匣的无变形精密加工成形。研究揭示了旋印电解加工阳极成形规律、难加工材料脉动态溶解机理、电解液流场分布特性等基础科学问题,突破了阴极工具设计、钛合金点蚀抑制、流场优化设计等关键技术,研制出具有自主知识产权的大型旋印电解机床,实现了大型薄壁机匣的高效精密加工,为新型航空发动机的研制和生产提供了重要的技术支撑。Aero-engine casings are important connecting and bearing components in aero-engine.Because of their complex structures,weak rigidity and difficult-to-machining materials,there are many manufacturing problems remaining for casing part such as serious machining deformation and poor accuracy of wall thickness,which has become a bottleneck restricting the development and production of new aero-engines.Aiming at this requirement,we propose a new method named counter-rotating electrochemical machining(CRECM).During CRECM,a revolving cathode tool is used,and the anode workpiece and cathode tool rotate oppositely at the same rotational speed.As the material is dissolved accurately layer by layer in CRECM,the large thin-walled casing part can be machined precisely without deformation.The fundamental scientific problems involved in CRECM such as the anode shaping rule,the pulse dynamic dissolution mechanism of difficult-to-cut materials and the distribution characteristics of electrolyte flow field are revealed.The key technologies such as cathode tool design,pitting inhibition of titanium alloy and optimization design of electrolyte flow field are broken through.Moreover,a large-scale CRECM machine with independent intellectual property rights has been developed,and large thin-wall casing parts are fabricated efficiently and precisely.The research provides important technical support for the development and production of new aero-engines.

关 键 词：航空发动机 机匣 变形 精度 旋印电解加工 机床 

分 类 号：V261.5[航空宇航科学与技术—航空宇航制造工程]